Enforce kotlin warnings as errors in InputTests

This will prevent us from having to look at kotlin warnings during
build.

Bug: 271455682
Test: atest InputTests
Change-Id: I834c97094534fcc3c2b103f0d5ddd07e405e4b24
diff --git a/tests/Input/Android.bp b/tests/Input/Android.bp
index 83893ba..a4c48fd 100644
--- a/tests/Input/Android.bp
+++ b/tests/Input/Android.bp
@@ -13,6 +13,9 @@
         "src/**/*.java",
         "src/**/*.kt",
     ],
+    kotlincflags: [
+        "-Werror",
+    ],
     platform_apis: true,
     certificate: "platform",
     static_libs: [